Horn for talking machines



Dec. 6,, 1927. 1,651,841

B R, EA RQ K HQRN F'OR. TALKING MACHINES Filed Sept. 26, 1918 {Sheets-Sheet l Dec. 6, 1927.

B. R. SEABROOK 1101111 FOR TALKING MACHINES Filed Sept. 26, 1918 2 h etshe 2 Patented Den. 6, 1927- e tries.

aren't BAGS'ZLTJE SIEABRQOK, Q]? VIINNIEPEG, IEANITOBA, QANADA.

HD3311? TALKING :MACHINEEl.

Application filed September 26, 1918.

The invention relates to improvements in horns for talking machines, particularly amplifying horns, and the general object oi": the invention is to provid an improved type of horn which will receive sound waves and deliver the sound in a full, clear, pure and natural manner and without mull-ling or choking the same.

A further object of the inventionis to provide a horn having a reinforced neck and the flaring end thereof gradually tapering in thickness from the neck to the delivery end and to make the horn from a specially treated body of paper-like porous material having one or more layers of cementitious composition, that is self-setting and becomes nonvibrant when it has set, to form the body of the horn;

A further object of the invention is to construct a horn having a specially shaped neck of extra thickness also formed of 11011-33680- nant composition similar to the horn body of which it forms a homogeneous gradually thickening continuation. The disclosure herein constitutes a further development of the subject matter of Serial Number 240,475 filed June 17, 1918.

YVith these and other objects in view, it il lustrate in the accompanying drawings such instances of adaptation as disclose the broad underlying features of the invention without limiting myself to the specific exeinplitying details shown thereon and described herein.

With the above more important objects in -iow the invention consists essentially in the arrangement and construction of parts here inatlter more particularly described and later pointed out in the appended claims, reference being had to the accompanying drawings in which Fig. 1 represents a side view of the complete horn with portions broken away to ex: pose construction.

Fig. 2 represents a plan view of thehorn.

3 represents an end view thereof.

Fig. 4 represents an enlarged detailed longitudinal sectional view centrally through the horn.

Fig. 5 represents a horizontal cross sectional view through the neck of the horn, the section. being taken in the plane denoted by the line XX' Fig. 4.

Fig; 6 r presents a horizontal cross tions iew through the of the berm serial No. 255,799

the section being taken in the plane denoted by the line YY 7 represents a horizotnal cross sectional view through the neck of the horn, the section being taken in the plane denoted by the line Z Z 4. I

Fig. 8 represents an enlarged detailed sectional view through the horn, the section showing the successive layers or courses at the point where what might be termed the first reinforcement starts.

9 represents an enlarged detailed sectional view through the horn, the section showing the successive layers or courses at the point where what might be termed the second reinforcement starts.

in the drawings like characters of refer' ence indicate corresponding parts in the several figures.

The horn indicated generally by the reference numeral 1 comprises what might be ermed a flaring body part 2 and a neck 3 continuous with the body part and positioned more or less at right angles thereto. 4 represents the entry end of the horn and 5 the delivery end. The neck embodies an elbow like part 6 which elbow, tor the purposes oft-his description, is considered as thatpart oi the neck appearing between the lines and Z Z and is actually the connecting part between the vertically disposed portion oi the neck and the horizontally disposed inner end of the horn body. The vertically disposed part of the neck, that is to say that part extending; from the entrance end l to the line XX, has the interior thereof circular in cross section and at the point where the elbow connects with the horn body the interior cross section is elliptical. Between the one end. of the elbow and the other, that is to say between the circular end and the elliptical end, the elbow gradually merges from a circular shape into an elliptical shape and gradually increases interiorly in crosssectional area.

in constructing the born, that part of the neck appearing above the line X-X is formed with a comparatively thick wall, be ing considerably thicker at the front than at the back as indicated at 7 and 8 (see Fig. 5) and have the side walls gradually decreasing in thickness in passing from the front to the u 1 .a Y.. mow is somewhat .mrshed in location indicated line thickness t is wont but maintains'the same thick at the m 10 and has the thickness in i ack (tee i latch as indicated at 9 and assing; from the front the Between the locations lines X-X and YY the horn gradually cha nor from the section shown i .hown in ti.

Between the locations indicated by the lines .YY" and Z-Z the neck gradually decreases in thickness in a regular manner from the section as shown in. Fig. 6 to that Jl'lOWll in Fig. 7.

From the inner end of the elbow, that is to say from the location indicated by the line ZZ, the body 01'? the horn gradually decreases in thick 25, being smallestat the clelivery end 5 or L116 horn and it gradually flares from a comparatively small elliptical shape into a large one at the delivery end.

The hornis constructed in a special way, being made from shell of paper like meaerial such as papier-mach specially treated as'shortly desci ed afterwards coated with successive layers or courses of material built up to give the required shape to the horn as herein before described in detail.

In making the horn l first shape the paper like shell 1 and then impregnate it with a selt-settine' liquid solution which permeates the shell, i'illing the pores and which, upon setting, stii'icns the shell. This cart of the construction indicated by dots applied in the sectional views in the drawings. litter the liquid solution has set the horn is given coaoin", both inside and out, of shellac as indicated at 12. Upon this hardenin the horn is then completely enshrouded w h a fabric covering indicated at 13 which fabric, such as linen, is wettcd by a wine like material and is then pulled t ghtly around the horn, both neck and body, the edges being lapped.

Owing to the tact that the fabric is wet it. in dragging, shrinks with the result that after the glue like material and fabric are dry the fabric is most tightly drawn around the horn. I next apply, both inside and out, a coating of specially selected -non-shrinkable and very adhesiie cement as indicated at I l, this coating being applied somewhat thicker at the neck than elsewhere. Upon this hardening I then cnshroud "the neck and say about twothirds of the body 01" the horn next the neck with a further fabric "covering which is applied on the horn in the same maimer as the first fabric covering. Over this I place a further COlLtlDQ of cement- 16, the cement coating beingagain made thicker at the neck than elsewhere. Upon the cement hardening I again en shroud the neck and the inner end of the horn body in a further fabric covering 17 .givein-both inside and out, acoating of shellac l9 and upon this hardening I finish both inside and out with a final coating of varnish indicated at 20.

By applying the various courses of fabric and cement in the manner above described I am able to gradually build up the horn so that it gradually diminished in thickness from the elbow outwardly to the delivery and such that the neck and entrance end he horn present the form as shown in the various cro sections in the drawings and as her 'n lit-fore more fully described.

ll hilst l have shown and described three courses of fabric and cement around the nt 361 body or shell, still I wish it to be untood that I do not wish to he limitedto is precise construction as these could be eased or diminished, depending on the e of horn which being built.

In c nnection with the dually diminishl11ll1ZClfllGSS oi the horn from the neck to the delivery end, I. may state that this is made possible by applying the successive courses of cement so that they graduate in passing; to the delivery end of the horn.

A horn n ai'le in the above manner is pardesirable tor the use for which it particularly light, strong. and inexpensive and I have found in constructing); it in the particular manner shown that it is especially c'lli'ective in carryinn the sound. waves and delivering them in manner such that when used on a talking machine the oroduction :full, clear and natural.

The charmteristics o't horns formed of a hardened cement-like composition which lually increase in thick! s from the large end to the small end are not of themselves vibrant, because the inertia of such a mass and the nature of the composition makes them quitc unresponsive within the range of the sound vibrations that enter amplifying horns from any source whatever. An amplifying horn made of a non-responsive cement-1i kc composition does not change thetorm of pass ng; waves since the inertia of theheavy composition shaped into a varying; thickness wall is such that itoannot setup interferences. Should an an'iplifying horn he responsive in the sense of setting up s cs, l'l c would lie-super- 1. An amplifying horn having the body 

